Couple of things: 1) It'd be helpful if we can see the cypress code you've written so far to see where you're going wrong.

within()

is a fairly self-explanatory API, so it shouldn't be too difficult to see what's up 2) If you're wanting to have selectable elements that are resilient to code changes, don't use class based selectors. Instead, encourage your devs to add test ids to the elements (or add them yourself). See https://docs.cypress.io/guides/references/best-practices#Selecting-Elements